function daumenKino() {
    var $alt = $('#animation img.obersteebene');
    var $neu = $alt.next().length ? $alt.next() : $('#animation img:first');
    $alt.addClass('mittlereebene');
	  $alt.removeClass('obersteebene');
    $neu.css({opacity: 0.0});
    $neu.addClass('obersteebene');
    $alt.animate({opacity: 0.0}, 2500);    
    $neu.animate({opacity: 1.0}, 3000, function() {
    $alt.removeClass('mittlereebene');
    });
}

$(document).ready(function() {
	setInterval( "daumenKino()", 3000 );
});